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Multiphysics Simulations Supersonic nozzle flow against a flat plate, showing density (grey) and vorticity (colors). Read More >

Rocstar Simulation Cutaway of a joint slot in the Space Shuttle solid motor showing inhibitor fluid-structure interaction. Read More >

Shape3D

characterization of particle packs

Shape3D is a serial code for the characterization and fitting of a voxel-described particle pack to a set of idealized shapes and the binning of these particles based on their geometric properties. At present, particles can be represented as idealized ellipsoids and cuboids. Output from a particle segmentation analysis program, which provides the particle distributions, is required as a starting point for analysis using Shape3D.

Shape3D offers four distinct binning methods from which to choose when processing a pack. The most appropriate method will depend on the pack under consideration and can require several iterations to determine. Visualizing the resulting scatter plot data will help to identify the distribution of particles within the pack. Depending on the number of peaks and the desired results, the binning method can be selected. The binning of the particles is made apparent by applying a different color for each bin in the scatter plot.

shape3

For this example, the bins can be seen starting within the peak of the single mode and moving outward from the peak. Looking at the scatter plot, it can be observed that the pack is monomodal and has a broad distribution in diameter and eccentricity that cannot be ignored.

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The pack is bimodal, though the separation between the modes is difficult to discern in the scatter plot. The bins more accurately describe the statistics with multiple bins per mode than a single bin per mode.